Planes are able to fly because of the lift generated by their wings. Lift is a force that opposes the weight of an object and causes it to move upwards. For a plane, lift is generated when air flows over its wings. The shape of the wings and the angle at which they are positioned to the airflow creates a low-pressure area above the wings and a high-pressure area below the wings. This difference in pressure creates lift.
In addition to lift, planes also require thrust to move forward. Thrust is generated by the plane's engines, which propel the plane through the air.
Birds
Birds are able to fly because of their wings and their light frames. Birds' wings are lightweight and strong, and they are covered in feathers. The feathers help to create lift by directing the airflow over the wings. Birds also have powerful flight muscles that allow them to flap their wings and generate the necessary lift for flight.
Comparison
While planes and birds both use lift to fly, there are some key differences between the two. First, planes can only fly if they have a continuous source of power to generate thrust. Birds, on the other hand, can use their wings to flap and generate lift without any external power source. Second, planes are able to fly at much higher speeds than birds. This is because they have sleek, streamlined designs and much more powerful engines. Finally, planes have the ability to take off and land on the ground, while birds can only take off and land from a tree or other elevated perch.